Electrochemical apparatus and electronic apparatus

Abstract

An electrochemical apparatus includes an electrolyte solution comprising a compound of Formula Iand a compound of Formula IIwherein R1 is C1 to C10 alkyl, and R2 is halogenated C1 to C10 alkyl; and R21, R22, R23 and R24 are each independently fluorine, or unsubstituted or halogenated C1 to C3 alkyl, and at least one of R21, R22, R23 and R24 includes fluorine.

What is claimed is: 
     
         1 . An electrochemical apparatus, comprising a positive electrode, a negative electrode, a separator, and an electrolyte solution; wherein the electrolyte solution comprises a compound of Formula I and a compound of Formula II; wherein the compound of Formula I is 
       
         
           
           
               
               
           
         
         wherein R 1  is C 1  to C 10  alkyl, and R 2  is halogenated C 1  to C 10  alkyl; and 
         the compound of Formula II is 
       
       
         
           
           
               
               
           
         
         wherein R 21 , R 22 , R 23  and R 24  are each independently fluorine, or unsubstituted or halogenated C 1  to C 3  alkyl, and at least one of R 21 , R 22 , R 23  and R 24  comprises fluorine. 
       
     
     
         2 . The electrochemical apparatus according to  claim 1 , wherein the compound of Formula I is at least one selected from the following compounds: 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
     
     
         3 . The electrochemical apparatus according to  claim 1 , wherein based on a mass of the electrolyte solution, a mass percentage of the compound of Formula I is 10% to 80%. 
     
     
         4 . The electrochemical apparatus according to  claim 3 , wherein the mass percentage of the compound of Formula I is 30% to 73%. 
     
     
         5 . The electrochemical apparatus according to  claim 1 , wherein the compound of Formula II is at least one selected from the following compounds: 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
     
     
         6 . The electrochemical apparatus according to  claim 1 , wherein based on a mass of the electrolyte solution, a mass percentage of the compound of Formula II is 5% to 25%. 
     
     
         7 . The electrochemical apparatus according to  claim 1 , wherein based on a mass of the electrolyte solution, a ratio of a mass percentage of the compound of Formula I to a mass percentage of the compound of Formula II ranges from 1.25 to 16. 
     
     
         8 . The electrochemical apparatus according to  claim 7 , wherein the ratio of the mass percentage of the compound of Formula I to the mass percentage of the compound of Formula II ranges from 5.5 to 13. 
     
     
         9 . The electrochemical apparatus according to  claim 1 , wherein based on a mass of the electrolyte solution, a sum of a mass percentage of the compound of Formula I and a mass percentage of the compound of Formula II ranges from 18% to 87.5%. 
     
     
         10 . The electrochemical apparatus according to  claim 9 , wherein the sum of the mass percentage of the compound of Formula I and the mass percentage of the compound of Formula II ranges from 48% to 81%. 
     
     
         11 . The electrochemical apparatus according to  claim 1 , wherein the electrolyte solution further comprises a first lithium salt; wherein the first lithium salt comprises at least one selected from the group consisting of lithium hexafluorophosphate and lithium bis(fluorosulfonyl)imide. 
     
     
         12 . The electrochemical apparatus according to  claim 11 , wherein based on a mass of the electrolyte solution, a ratio of a mass percentage of the compound of Formula I to a mass percentage of the first lithium salt ranges from 0.8 to 8. 
     
     
         13 . The electrochemical apparatus according to  claim 12 , wherein the ratio of the mass percentage of the compound of Formula I to the mass percentage of the first lithium salt ranges from 4 to 6.3. 
     
     
         14 . The electrochemical apparatus according to  claim 1 , wherein the electrolyte solution further comprises a second lithium salt; wherein the second lithium salt comprises at least one selected from the group consisting of lithium bistrifluoromethanesulfonimide, lithium tetrafluoroborate, lithium difluoro(oxalato) borate, lithium bis(oxalato)borate, and lithium difluorophosphate; and
 based on a mass of the electrolyte solution, a mass percentage of the second lithium salt is 0.2% to 10%.   
     
     
         15 . The electrochemical apparatus according to  claim 1 , wherein the electrolyte solution further comprises lithium difluorophosphate; and based on a mass of the electrolyte solution, a mass percentage of the lithium difluorophosphate is 0.01% to 0.96%. 
     
     
         16 . The electrochemical apparatus according to  claim 1 , wherein the electrolyte solution further comprises lithium difluorophosphate; and based on a mass of the electrolyte solution, a ratio of a mass percentage of the compound of Formula II to a mass percentage of the lithium difluorophosphate ranges from 5 to 75. 
     
     
         17 . The electrochemical apparatus according to  claim 1 , wherein the electrolyte solution satisfies at least one of the following conditions:
 (1) the electrolyte solution comprises ethylene carbonate, propylene carbonate and lithium hexafluorophosphate;   (2) the electrolyte solution comprises ethylene carbonate, propylene carbonate, diethyl carbonate and lithium hexafluorophosphate;   (3) the electrolyte solution comprises ethylene carbonate, propylene carbonate, diethyl carbonate, lithium hexafluorophosphate and lithium difluorophosphate; or   (4) the electrolyte solution comprises ethylene carbonate, propylene carbonate, lithium hexafluorophosphate, and any two selected from the group consisting of lithium bistrifluoromethanesulfonimide, lithium tetrafluoroborate, lithium difluoro(oxalato) borate, lithium bis(oxalato)borate, and lithium difluorophosphate.   
     
     
         18 . The electrochemical apparatus according to  claim 1 , wherein the positive electrode comprises a positive active material; wherein the positive active material comprises lithium cobalt oxide, and a particle size of the positive active material satisfies the following condition: Dv 50  is 10 μm to 25 μm, Dv 10  is 2 μm to 10 μm. 
     
     
         19 . The electrochemical apparatus according to  claim 18 , wherein Dv 50  is 14.1 μm to 16.5 μm, Dv 10  is 3.8 μm to 5.8 μm. 
     
     
         20 . An electronic apparatus, wherein the electronic apparatus comprises the electrochemical apparatus according to  claim 1 .